linux-kernel - [PATCH 5.10.y] drm/amd/pm: Fix negative array index read

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Message-ID: <20250408005916.3362084-1-jianqi.ren.cn@windriver.com>
Date: Tue, 8 Apr 2025 08:59:16 +0800
From: <jianqi.ren.cn@...driver.com>
To: <stable@...r.kernel.org>
CC: <Tim.Huang@....com>, <Jesse.Zhang@....com>, <patches@...ts.linux.dev>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
        <jianqi.ren.cn@...driver.com>, <harry.wentland@....com>,
        <sunpeng.li@....com>, <Rodrigo.Siqueira@....com>,
        <alexander.deucher@....com>, <christian.koenig@....com>,
        <Xinhui.Pan@....com>, <airlied@...il.com>, <daniel@...ll.ch>,
        <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <chiahsuan.chung@....com>, <alex.hung@....com>,
        <daniel.wheeler@....com>, <hersenxs.wu@....com>
Subject: [PATCH 5.10.y] drm/amd/pm: Fix negative array index read

From: Jesse Zhang <jesse.zhang@....com>

[ Upstream commit c8c19ebf7c0b202a6a2d37a52ca112432723db5f ]

Avoid using the negative values
for clk_idex as an index into an array pptable->DpmDescriptor.

V2: fix clk_index return check (Tim Huang)

Signed-off-by: Jesse Zhang <Jesse.Zhang@....com>
Reviewed-by: Tim Huang <Tim.Huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
[Minor conflict resolved due to code context change.]
Signed-off-by: Jianqi Ren <jianqi.ren.cn@...driver.com>
Signed-off-by: He Zhe <zhe.he@...driver.com>
---
Verified the build test
---
 .../gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c   | 21 ++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
index a7773b6453d5..0af9ee3a520a 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
@@ -900,19 +900,22 @@ static int navi10_get_current_clk_freq_by_table(struct smu_context *smu,
 					   value);
 }
 
-static bool navi10_is_support_fine_grained_dpm(struct smu_context *smu, enum smu_clk_type clk_type)
+static int navi10_is_support_fine_grained_dpm(struct smu_context *smu, enum smu_clk_type clk_type)
 {
 	PPTable_t *pptable = smu->smu_table.driver_pptable;
 	DpmDescriptor_t *dpm_desc = NULL;
-	uint32_t clk_index = 0;
+	int clk_index = 0;
 
 	clk_index = smu_cmn_to_asic_specific_index(smu,
 						   CMN2ASIC_MAPPING_CLK,
 						   clk_type);
+	if (clk_index < 0)
+		return clk_index;
+
 	dpm_desc = &pptable->DpmDescriptor[clk_index];
 
 	/* 0 - Fine grained DPM, 1 - Discrete DPM */
-	return dpm_desc->SnapToDiscrete == 0 ? true : false;
+	return dpm_desc->SnapToDiscrete == 0 ? 1 : 0;
 }
 
 static inline bool navi10_od_feature_is_supported(struct smu_11_0_overdrive_table *od_table, enum SMU_11_0_ODFEATURE_CAP cap)
@@ -964,7 +967,11 @@ static int navi10_print_clk_levels(struct smu_context *smu,
 		if (ret)
 			return size;
 
-		if (!navi10_is_support_fine_grained_dpm(smu, clk_type)) {
+		ret = navi10_is_support_fine_grained_dpm(smu, clk_type);
+		if (ret < 0)
+			return ret;
+
+		if (!ret) {
 			for (i = 0; i < count; i++) {
 				ret = smu_v11_0_get_dpm_freq_by_index(smu, clk_type, i, &value);
 				if (ret)
@@ -1127,7 +1134,11 @@ static int navi10_force_clk_levels(struct smu_context *smu,
 	case SMU_UCLK:
 	case SMU_FCLK:
 		/* There is only 2 levels for fine grained DPM */
-		if (navi10_is_support_fine_grained_dpm(smu, clk_type)) {
+		ret = navi10_is_support_fine_grained_dpm(smu, clk_type);
+		if (ret < 0)
+			return ret;
+
+		if (ret) {
 			soft_max_level = (soft_max_level >= 1 ? 1 : 0);
 			soft_min_level = (soft_min_level >= 1 ? 1 : 0);
 		}
-- 
2.34.1